Those two have way passed the classification of gems. By gem we refer to undiscovered and relatively unknown projects that can do well when tapped into. Bitcoin and ETH have long been discovered. In fact, both are the two major coins on the lips of everyone including those who are new to this industry. Some people even think Bitcoin is the only cryptocurrency.

OP, you may want to check projects like Cartesi and CiFi. I like both projects and I think they're undervalued right now.